Black holes are some of the most mysterious objects in the universe from "summary" of Astrophysics for People in a Hurry by Neil deGrasse Tyson
Black holes are regions in space where gravity is so strong that nothing, not even light, can escape its pull. They are some of the most mysterious objects in the universe, and scientists have been studying them for decades to unravel their secrets. One of the key characteristics of black holes is their immense density, which comes from the fact that they are formed when massive stars collapse under their weight. As a result, they have a gravitational pull so strong that not even light can escape. This makes them invisible to the naked eye, which adds to their enigmatic nature. Another intriguing aspect of black holes is their event horizon, which is the point of no return for anything that gets too close. Once an object crosses this boundary, it is inevitably pulled into the black hole, never to be seen again. This concept goes against our everyday understanding of how the universe works...
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